Coke has more of the "cola" taste, and therefore its my choice.
Crystal Pepsi screwed with my head. No matter how many times I drank it, there was a short-circuit in my head between the clear color and the cola taste. It bothered me too much. I would imagine eating that green ketchup, like Heinz is selling for kids would do the same mindf*ck to me.
Lemon flavored coke and pepsi, both taste artificially lemony and get annoying after more than one or two.
Cherry-coke or pepsi....ehh, its not bad, but again not all the time...
Why mess with perfection? Just pick up a good ol' Coke and you are set.